Add more CDMA SamsungRIL fixes.

Adds a collection of CDMA device fixes to SamsungRIL.  They include:

- Overriding ERROR_UNSPECIFIED fail cause with NORMAL_CLEARING, to prevent
  far-end hangups from displaying the "Call Lost" dialog.

- Adding, and ignoring the RIL_UNSOL_GPS_NOTI request, which is also
  ignored in the TW RIL, to keep the radio log clean of exceptions when the
  GPS is active.

- Workaround for Samsung CDMA "ring of death" bug.  See source comments for
  details on this problem.

Change-Id: Ida4797718ad3463d073a6fc27246cc916526d487